137 lines
4.7 KiB
Plaintext
137 lines
4.7 KiB
Plaintext
;/*
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; FreeRTOS V6.0.1 - Copyright (C) 2009 Real Time Engineers Ltd.
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;
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; ***************************************************************************
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; * *
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; * If you are: *
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; * *
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; * + New to FreeRTOS, *
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; * + Wanting to learn FreeRTOS or multitasking in general quickly *
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; * + Looking for basic training, *
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; * + Wanting to improve your FreeRTOS skills and productivity *
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; * *
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; * then take a look at the FreeRTOS eBook *
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; * *
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; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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; * http://www.FreeRTOS.org/Documentation *
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; * *
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; * A pdf reference manual is also available. Both are usually delivered *
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; * to your inbox within 20 minutes to two hours when purchased between 8am *
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; * and 8pm GMT (although please allow up to 24 hours in case of *
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; * exceptional circumstances). Thank you for your support! *
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; * *
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; ***************************************************************************
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;
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; This file is part of the FreeRTOS distribution.
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;
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; FreeRTOS is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License (version 2) as published by the
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; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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; ***NOTE*** The exception to the GPL is included to allow you to distribute
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; a combined work that includes FreeRTOS without being obliged to provide the
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; source code for proprietary components outside of the FreeRTOS kernel.
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; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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; more details. You should have received a copy of the GNU General Public
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; License and the FreeRTOS license exception along with FreeRTOS; if not it
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; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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; by writing to Richard Barry, contact details for whom are available on the
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; FreeRTOS WEB site.
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;
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; 1 tab == 4 spaces!
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;
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; http://www.FreeRTOS.org - Documentation, latest information, license and
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; contact details.
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;
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; http://www.SafeRTOS.com - A version that is certified for use in safety
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; critical systems.
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;
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; http://www.OpenRTOS.com - Commercial support, development, porting,
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; licensing and training services.
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;*/
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.import _pxCurrentTCB
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.import _vTaskSwitchContext
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.export _vPortStartFirstTask
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.export _ulPortGetGBR
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.export _vPortYield
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.section P
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_vPortStartFirstTask:
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; Get the address of the pxCurrentTCB variable.
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mov.l #_pxCurrentTCB, r15
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; Get the address of the task stack from pxCurrentTCB.
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mov.l @r15, r15
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; Get the task stack itself into the stack pointer.
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mov.l @r15, r15
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; Restore r0 to PR (PR is used in place of r15).
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movml.l @r15+, r15
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; Restore system registers.
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ldc.l @r15+, gbr
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lds.l @r15+, mach
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lds.l @r15+, macl
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; Pop the SR and PC to jump to the start of the task.
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rte
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nop
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_vPortYield:
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; Save registers in the same order used by the CPU itself.
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sts.l macl, @-r15
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sts.l mach, @-r15
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stc.l gbr, @-r15
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movml.l r15, @-r15
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; Get the address of pxCurrentTCB
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mov.l #_pxCurrentTCB, r0
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; Get the address of pxTopOfStack from the TCB.
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mov.l @r0, r0
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; Save the stack pointer in pxTopOfStack.
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mov.l r15, @r0
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mov.l #_vTaskSwitchContext, r0
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jsr @r0
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nop
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; Get the address of the pxCurrentTCB variable.
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mov.l #_pxCurrentTCB, r15
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; Get the address of the task stack from pxCurrentTCB.
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mov.l @r15, r15
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; Get the task stack itself into the stack pointer.
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mov.l @r15, r15
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; Restore r0 to PR (PR is used in place of r15).
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movml.l @r15+, r15
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; Restore system registers.
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ldc.l @r15+, gbr
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lds.l @r15+, mach
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lds.l @r15+, macl
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; Pop the SR and PC to jump to the start of the task.
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rte
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nop
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_ulPortGetGBR:
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stc.l gbr, r0
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rts
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nop
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.end
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